POCl3, or phosphorus oxychloride, is a chemical compound composed of phosphorus, oxygen, and chlorine. It appears as a colorless to yellowish liquid and is known for its strong reactivity. POCl3 is commonly used as a reagent in organic synthesis, particularly in the conversion of alcohols to chlorides. This compound is also utilized in the production of various phosphorus-containing chemicals and as a dehydrating agent. Due to its corrosive nature, POCl3 must be handled with care, using appropriate safety measures to prevent exposure and chemical burns.